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Information for developing and testing of software for HMRC forms, returns and messages.
How to register as a software developer with HMRC.
Find software developers that can help with entry summary declarations including safety and security declarations for imports.
Check a list of software developers who can provide Customs Declaration Service and Customs Handling of Import and Export Freight (CHIEF) software.
Use this list to find individual software suppliers and commercial products to use to file online with HMRC online services.
Technical specifications for software developers working with the PAYE online service.
Call or email HMRC to get technical information and support if you're a software developer
Find guidance on PAYE updates for software developers.
Find Document Submission Protocol guidance for architects, software developers and other parties interested in building Transaction Engine client applications.
Find technical specifications and support for software developers working with the Construction Industry Scheme Online service.
Descriptions of team capabilities on the Digital Outcomes and Specialists framework.
Support and technical specifications for software developers working with the Self Assessment online service.
Find technical specifications for software developers working with the Corporation Tax online service.
Specifications and guidelines for Real Time Information internet submissions and for the outgoing Data Provisioning Service.
Guidance on APIs and how to find commercial software suppliers for different HMRC online services.
The team capabilities available on the Digital Outcomes framework.
If you're a software developer, use the HMRC Developer Hub to learn about and integrate your applications with our RESTful APIs.
Support and technical specifications for software developers working with the Charities Online service in making repayment claims.
Use this guidance for support if you're a software developer working with the Self Assessment Online service.
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